Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Owner Discussion Groups > Discussion Groups > Catalina

Thread Tools Display Modes
  #1   IP:
Old 12-19-2007, 02:57 AM
Overspendin' Overspendin' is offline
Senior Member
Join Date: Oct 2006
Posts: 46
Thanks: 0
Thanked 0 Times in 0 Posts
The ideal prop for a C30?

As you may know via, I'm in the middle of a serious refit.
I'd like suggestions for the ideal non-feathering prop for an A4 powered C30.
I currently run a 12 x 7 two bladed prop which I find almost acceptable.
the boat is used primarily for day sailing or cruising.
I've recently located to a small yacht club near my home that usually has serious wind
and current issues to deal with when docking, not to mention prop-walk.
I'm not overly concened with drag, but I'd like to get as much oomph as I can...ideas?
Reply With Quote
  #2   IP:
Old 12-19-2007, 09:41 AM
jayw jayw is offline
Senior Member
Join Date: Feb 2007
Location: Plymouth, MA
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
I contacted Michigan Wheel and filled out their form for prop selection: and then emailed one of their tech people who were very helpful in figuring out how I had used the form incorrectly. I'm very pleased with the 3-blade prop that they recommended for my A4 with a reduction gear.
If I had a direct drive A4, I would contact Indigo to inquire about their 3-blade prop.
Prop walk is an issue with my Bristol 35.

Last edited by jayw; 12-19-2007 at 09:44 AM.
Reply With Quote
  #3   IP:
Old 12-19-2007, 10:20 AM
Jesse Delanoy Jesse Delanoy is offline
Afourian MVP
Join Date: Dec 2006
Posts: 236
Thanks: 0
Thanked 0 Times in 0 Posts
I have the Indigo three-blade prop on my Catalina 30, and I'm very satisfied with it. Much less prop walk and much easier maneuvering in reverse than with my prior two-blade prop.
Reply With Quote
  #4   IP:
Old 11-19-2008, 01:30 PM
sastanley's Avatar
sastanley sastanley is offline
Afourian MVP
Join Date: Sep 2008
Location: Solomons, MD
Posts: 6,611
Thanks: 568
Thanked 326 Times in 257 Posts
Question old thread!

Hi Jesse,

Since I know you still frequent the A4 board, I hope you'll see this.

What is your latest thoughts on the Indigo prop a year after this post?

My concerns are drag (i am a racer at heart!!) and still like to cruise fast

Does it all the RPM to get up more than an overpitched/sized two-blade?

Although down on my priority list quite a bit, I have been thinking about a prop change if it is useful at the higher end of the motoring spectrum, possibly the CDI...and more information without spending any money is always useful!
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
She is always happy with a clean bottom!
Reply With Quote
  #5   IP:
Old 11-19-2008, 02:14 PM
Jesse Delanoy Jesse Delanoy is offline
Afourian MVP
Join Date: Dec 2006
Posts: 236
Thanks: 0
Thanked 0 Times in 0 Posts

I've had the Indigo 3-bladed prop for several years now, and I'm still satisfied with it. I haven't noticed any additional drag from when I had a larger, two bladed prop, and in fact I think I recall seeing a spec that indicated that the Indigo does not increase drag materially (or perhaps not at all). It's a fair bit smaller in diameter than the old two-bladed prop, so that makes up for the extra blade somewhat.
Reply With Quote
  #6   IP:
Old 11-19-2008, 03:33 PM
Dave O Dave O is offline
Senior Member
Join Date: Nov 2007
Location: Port Credit, ON
Posts: 74
Thanks: 0
Thanked 0 Times in 0 Posts
By co-incidence I just ordered an Indigo prop yesterday after checking any number of threads and suggestions on this board and others. Ultimately I decided that Indigo was probably the best bet for me and we'll see in the spring.

My principal concern did not have to do with drag but in the back-and-forth with the Indigo people they mentioned this:

I do not have any hard data with regard to drag. I do know that when you compare the frontal area of our 3 blade prop with a standard 12" diameter two blade "Sailor" prop, our prop has about 8% more area. You will see a little more difference yet. Having said that, I do not think you will be able to perceive the difference. If you were going from a folding prop to ours, probably you would notice the difference.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
prop performance baileyem General Interest 3 06-07-2007 09:30 PM
Folding Prop daveinrenton Drive Train / Propellers 1 03-28-2007 02:34 PM
removing prop smosher Drive Train / Propellers 1 06-05-2006 07:39 AM
Prop effect on A4 Performance raleighm Drive Train / Propellers 2 04-29-2005 11:47 AM
Prop for a Triton Unregistered Drive Train / Propellers 2 04-16-2005 01:35 AM

All times are GMT -4. The time now is 05:23 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2019 Moyer Marine Inc.

All Rights Reserved